|Elevation||694 ft (212 m)|
|Area||0.74 sq mi (2 km2)|
|- land||0.74 sq mi (2 km2)|
|- water||0.00 sq mi (0 km2)|
|Density||1,583.9 / sq mi (612 / km2)|
|- summer (DST)||CDT (UTC-5)|
|Wikimedia Commons: Wenona, Illinois|
The Marshall County portion of Wenona is part of the Peoria Metropolitan Statistical Area, while the small portion that lies in LaSalle County is part of the Ottawa–Streator Micropolitan Statistical Area.
Wenona is located at  Most of the city lies in Marshall County, although a small portion extends into southern LaSalle County. In the 2000 census, all of Wenona's 1,065 residents lived in Marshall County. According to 2006 population estimates, 1,049 of the city's 1,058 residents (99.1%) lived in Marshall County and 9 (0.9%) lived in LaSalle County.(41.053080, -89.053415).
According to the 2010 census, the city has a total area of 0.74 square miles (1.9 km2), all land.
As of the census of 2000, there were 1,065 people, 453 households, and 278 families residing in the city. The population density was 1,583.9 people per square mile (613.7/km²). There were 504 housing units at an average density of 749.6 per square mile (290.4/km²). The racial makeup of the city was 97.65% White, 0.38% Black or African American, 0.47% Native American, 0.19% Asian, and 1.31% from two or more races. 1.50% of the population were Hispanic or Latino of any race.
There were 453 households out of which 26.7% had children under the age of 18 living with them, 52.1% were married couples living together, 6.8% had a female householder with no husband present, and 38.6% were non-families. 34.9% of all households were made up of individuals and 18.1% had someone living alone who was 65 years of age or older. The average household size was 2.35 and the average family size was 3.10.
In the city the population was spread out with 25.9% under the age of 18, 6.9% from 18 to 24, 25.4% from 25 to 44, 22.0% from 45 to 64, and 19.9% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 91.5 males. For every 100 females age 18 and over, there were 88.8 males.
The median income for a household in the city was $36,711, and the median income for a family was $45,714. Males had a median income of $32,237 versus $20,647 for females. The per capita income for the city was $17,951. About 4.2% of families and 7.8% of the population were below the poverty line, including 7.9% of those under age 18 and 11.2% of those age 65 or over.
- "Subcounty population estimates 2000-2006: Illinois" (CSV). United States Census Bureau, Population Division. 2007-06-28. Retrieved 2008-06-03.
- "2010 Census U.S. Gazetteer Files for Places – Illinois". United States Census. Retrieved 2012-10-13.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.